Stillwater River, river in western Ohio, U.S., that rises near the Indiana border and flows southeast to join Greenville Creek, then south to enter the Great Miami River at Dayton, after a course of 65 miles (105 km). A flood-control dam (1922) is on the Stillwater at Englewood.

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constituent state of the United States of America, on the northeastern edge of the Midwest region. Lake Erie lies on the north, Pennsylvania on the east, West Virginia and Kentucky on the southeast and south, Indiana on the west, and Michigan on the northwest. Ohio ranks 34th in terms of total area...

constituent state of the United States of America. The state sits, as its motto claims, at “the crossroads of America.” It borders Lake Michigan and the state of Michigan to the north, Ohio to the east, Kentucky to the south, and Illinois to the west, making it an integral part of the...

river issuing from Indian Lake, Logan county, west-central Ohio, U.S., and flowing south-southwest past Dayton, Middletown, and Hamilton to enter the Ohio River west of Cincinnati after a course of 170 miles (274 km). Its chief tributaries are the Stillwater, Mad, and Whitewater rivers. After...